The conservative National Review launched a broadside against Republican presidential front-runner Donald Trump on Thursday, publishing a scathing editorial that called the billionaire 'a menace to conservatism.' The magazine also published accompanying essays by 22 conservative thinkers opposing Trump's candidacy. Its cover carries the name of the National Review and the words 'Against Trump.' 'Donald Trump is a menace to American conservatism who would take the work of generations and trample it underfoot in behalf of a populism as heedless and crude as the Donald himself,' the editorial says in its closing sentence.